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Author: Subject: Chromatography of marker pens on chalk
Doktor Klawonn

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[*] posted on 25-11-2010 at 07:19
Chromatography of marker pens on chalk


This is a simple experiment for beginners I use in school. It is very easy to be performed, harmless and produces nice results.


- chalk
- marker pens
- Petri dishes
- water


anmalen.JPG - 17kB

chalk is painted on using marker pens. Draw around the chalk one cm from its end. You can use multiple colors on one piece of chalk.

wasserrein.JPG - 11kB

An appropriate number of Petri dishes are filled with water.

reinstelln.JPG - 13kB

The prepared pieces of chalk are put into the Petri dishes in an upright manner.

getrennt.JPG - 8kB

The water will move upwards the chalk and separate the colors.


The chalk used was made of gypsum. Chalk made of CaCO3 works too. The chalk can be used normally after drying for some days.


- This experiment as youtube video

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International Hazard

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[*] posted on 28-11-2010 at 17:51

I really like this. I'm always looking for new, safe, interactive chemistry demonstrations--especially ones that can illustrate important points.

"In the end the proud scientist or philosopher who cannot be bothered to make his thought accessible has no choice but to retire to the heights in which dwell the Great Misunderstood and the Great Ignored, there to rail in Olympic superiority at the folly of mankind." - Reginald Kapp.
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International Hazard

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[*] posted on 28-11-2010 at 18:31

Its also interesting to note the seperation of simular substances like the placement of the red bands in the red and the middle one(im assuming dark green?) and the movement of the yellow bands in the blue and the green on on the end.

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International Hazard

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[*] posted on 28-11-2010 at 19:27

I like it!

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